Emerson Process Management OXYMITTER 4000 IM-106-340 - Manual (Page 91)

Instruction Manual
IM-106-340, Rev. 4.0
May 2006
7-9
Oxymitter 4000
11. When the "Loop should be returned to automatic control" message
appears, return the Hazardous Area Oxymitter 4000 to the automatic
control loops previously removed and press OK.
12. At the STOP GAS status prompt, select menu item 2, NEXT CAL STEP
When the status displays PURGING, select menu item 4, EXIT, to leave
the O2 CAL procedure.
13. From the PERFORM O2 CAL screen, view menu item 3, CALSTATE, to
monitor the calibration status as it updates. Or, access the O2 CALI-
BRATE screen and select menu item 2, O2 CAL STATUS, to view menu
item 1, CAL-STATE; menu item 2, TIMEREMAIN; and menu item 3,
PRESENT O2, as the calibration status updates.
14. When CALSTATE displays COMPLETE, the calibration is finished.
DEFINING A TIMED
CALIBRATION VIA HART Use the following procedure to specify a time interval (in hours) at which the
Oxymitter 4000 will be automatically calibrated. If necessary, use the menu
tree in Figure 7-3 (Sheet 2 of 3) for reference.
NOTE
To select a menu item, either use the up and down arrow keys to scroll to the
menu item and press the right arrow key or use the number keypad to select
the menu item number. To return to a preceding menu, press the left arrow
key.
1. From the DEVICE SETUP screen, select DETAILED SETUP.
2. From the DETAILED SETUP screen, select O2 CALIBRATION.
3. From the O2 CALIBRATION screen, select menu item 6, CAL MODE.
Set the CAL MODE to AUTO.
4. Return to the O2 CALIBRATION screen and select menu item 7, CAL
INTRVL.
5. At the prompt, input a time interval (in hours) at which an automatic
calibration will occur; then press ENTER.
D/A TRIM PROCEDURE The D/A trim procedure is used to calibrate the 4-20 mA output signal to a
precision mA measurement device (calibrated digital ammeter, etc.). The
procedure is interactive and stored in the Oxymitter software.
Use one of the following communication methods to access the D/A trim
procedure:
LOI Menu
1. Use the "Z" pattern key entry to access the LOI menu.
2. Press the down key two times to access the SYSTEM menu.
3. Press the down key once to access the Input/Output menu.
4. From the Analog selection, press the right-pointing key to display the
Analog submenu listing.
5. Press the down key as needed to access Trim O2 Out.
6. Press the Enter key to start the trim procedure. Follow the LOI display
prompts to perform the trim procedure.